FI92827B - Process for the preparation of therapeutically useful 1- heteroaryl-3-acyl-2-oxindole derivatives - Google Patents

Abstract

Certain 1-heteroaryl-3-acyl-2-oxindoles wherein the acyl- substituent is thenoyl, furoyl, benzoyl or substituted benzoyl, are inhibitors of cycloxygenase and lipoxygenase enzymes and are useful as anti-inflammatory agents in mammals. <IMAGE>

Description

92827

Process for the preparation of therapeutically useful 1-heteroaryl-3-acyl-2-oxindole derivatives

BACKGROUND OF THE INVENTION Field of the Invention This invention relates to novel and useful non-steroidal anti-inflammatory agents. More particularly, it relates to certain 1-heteroaryl-3-acyl-2-oxindoles, which are potent inhibitors of cyclooxygenase (CO) and lipoxygenase (LO) and which are valuable anti-inflammatory agents in mammals.

Description of the Related Art U.S. Patent 4,556,672, issued December 3, 1985, describes a series of 3-acyl-2-oxindole-1-carboxamides in which the acyl group -C (= O) R is derived from a wide variety of organic carboxylic acids, including those in which R is phenyl, substituted phenyl, thienyl, furyl or other heterocyclyl groups. The compounds are useful as analgesics and anti-in-20 flammers. Related compounds in which the 1-carboxamide group is substituted by alkyl, phenyl, substituted phenyl, furyl, or thienyl are described in U.S. Patent 4,569,942, issued February 11, 1986, having similar utility. Each of said patents also discloses 3-acyl-2-oxindoles having an acyl group as defined above.

Analgesic and anti-inflammatory 1,3-diacyl-2-oxindoles in which the 1-acyl group is an alkanoyl group and the 3-acyl group is as disclosed in the aforementioned patents are described in U.S. Patent 4,690,943, issued September 1, 1987.

SUMMARY OF THE INVENTION

It has been found that certain compounds of formula (I)

3 O

«2

3 5 C-R

1-heteroaryl-3-acyl-2-oxindoles according to R 4 R 212927 or a pharmaceutically acceptable base salt thereof, wherein R 1 is thienyl, furyl or 2-thiazolyl; 5 R 2 is thienyl, furyl or ¥ 10 1

Y

wherein X is hydrogen, fluorine, chlorine, alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, alkyl lithio of 1 to 4 carbon atoms, nitro or trifluoromethyl; Y is hydrogen, fluorine or chlorine; and each of R 3 and R 4, which may be the same or different, is hydrogen, fluorine, chlorine, bromine, alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, alkylthio of 1 to 4 carbon atoms. carbon atoms, nitro or trifluoromethyl, are potent inhibitors of the CO and LO enzymes and are valuable as anti-inflammatory agents in the treatment of inflammatory disease in a mammal. They are particularly useful in rheumatoid arthritis Hoi-25 in mammals.

A preferred group of compounds is that wherein R 2 is phenyl or substituted phenyl. In this group of compounds, those in which one or both of X and Y are hydrogen, fluorine, chlorine or trifluoromethyl are preferred compounds. Particularly preferred in this group are those compounds wherein X and Y are each hydrogen, or X is 5-chloro and Y is 6-chloro, and R 1 is a 3-heteroaryl group.

Another preferred group of compounds includes those wherein R 2 is thienyl or furyl. Preferred in this group are those in which 92 is 2-thienyl or 2-furyl and R1 is a 3-heteroaryl group.

The present invention encompasses pharmaceutical compositions useful as anti-inflammatory agents in a mammal, comprising a pharmaceutically acceptable carrier and an anti-inflammatory disease treating amount of a compound of formula (I).

The present invention further comprises a method of treating an anti-inflammatory disease in a mammal, the method comprising administering to said mammal an anti-inflammatory disease-treating amount of a compound of formula (I).

Detailed Description of the Invention The compounds of this invention are readily prepared from suitable starting materials by the following method: R3 r3, φυ-Λ *

R4 H R R

(a) (b> R3 R3 «2 y A1 f k1 <c> (I) 30

The first step of the overall process is performed by reacting an indole (or an appropriately substituted indole) with the desired R 1 in a suitable solvent in the presence of a base and a catalytic amount of copper bromide. As a solvent, N-methyl-2-pyrrolidinone works particularly well. Other aprotic solvents such as dimethyl sulfoxide, dimethylformamide or diethylformamide may be used. The reaction is carried out at an elevated temperature, e.g. about 50 to 200 eC, preferably in a nitrogen-5 pi atmosphere. The choice of base is not critical but may be any of a variety of inorganic and organic bases. Examples of such bases are alkali metal hydrides, carbonates or hydroxides; triethylamine, pyridine, N-methylmorpholine, 4- (N, N-10 dimethylamino) pyridine and N-methylpiperidine.

The above ingredients are usually all placed in a reaction vessel, stirred and heated to the desired temperature until the reaction is complete. Although indole, R 1 Br, and base starting materials can be used in stoichi-15 meter ratios, it is preferred to use an excess of about 5 to 10% of each R 1 Br and base to promote the reaction. A larger excess of R1Br, e.g. up to 100%, can be used but is usually avoided for economic reasons. Copper bromide is used at a level of about 0.01 to 20 0.03 moles per mole of R1Br starting material. The product is recovered by known methods. The indole starting materials required are known compounds or are conveniently prepared according to known methods.

The second step, the conversion of the 1-substituted indole (b) to the corresponding oxindole (c), is performed by reacting the indole (b) with N-chlorosuccinimide (NCS) in a reaction-inert solvent at ambient temperature. An excess of 5 to 10% of the NCS is usually used. Reaction times of 1 to 5 hours, depending on the indole starting material (a), normally lead to a complete reaction. The reaction-inert solvent (i.e., one that does not react with the starting materials or products) can be any of a variety of solvents, such as diethyl ether, dioxane, tetrahydrofuran, aromatic hydrocarbons (benzene, li 92927 toluene, xylene), chloroform, acetonitrile, and mixtures thereof.

When the NCS reaction is complete, the reaction mixture is concentrated under reduced pressure and the 3-chloroindole derivative is taken up in glacial acetic acid and heated to about 50-80 ° C. Phosphoric acid (85%) is then added to the reaction mixture, which is refluxed for 1-24 hours, cooled and poured into ice water. The pH of the aqueous mixture is adjusted to 11-12 and then extracted with ethyl acetate to recover the oxindole. Treatment of the extract and purification of the oxindole product are performed by standard methods.

Coupling of the acyl unit to the 3-position of oxindole (c) is conveniently accomplished by (c) reacting an activated derivative of a suitable carboxylic acid of formula R 2 -C00H in a lower alkanol solvent (e.g. ethanol) in the presence of an alkali metal salt of a lower alkanol solvent (e.g. sodium ethoxide) in accordance with. Typical derivatives of acids include acid halides, e.g. acid chlorides, symmetrical acid anhydrides R2-C (= O) -O-C (= O) -R2, mixed acid anhydrides with hindered low molecular weight carboxylic acid, R2-C (* 0) -O-C (= O) -R5, wherein R5 is a large lower alkyl group, such as t-butyl, and mixed carboxylic carbonic anhydride. 25 R2-C (= O) -O-C (= O) -ORR6, wherein R6 is a lower alkyl group.

A small excess of the acid derivative of the formula R 2 -C (= O) -OH is usually used, and the alkoxide salt is usually present in an amount of 1-2 molar equivalents, based on said derivative of the acid of the formula R 2 -C (= O) -OH.

The reaction between an acid derivative of formula R 2 -C (= O) -OH and a compound of formula (c) is usually started at 0-25 ° C, but then it is customary to heat the reaction mixture at a temperature between 50 and 130 ° C and preferably about At 80 ° C, to react with lop-35 wood. Under these conditions, reaction times of from a few hours, e.g., two hours, to a few days, e.g., two days, are usually used. The reaction mixture is then cooled, diluted with excess water and acidified. The product of formula (I) can then be recovered by filtration or by a standard solution leaching method.

A common feature of the oxindole carboxamides of this invention is their acidic nature. Therefore, the present invention includes pharmaceutically acceptable salts of the compounds of formula (I). Preferred cations of said salts include ammonium, sodium and potassium ions. The pharmaceutically acceptable salts of the compounds described herein are prepared by conventional methods, such as by adding an acid to an aqueous solution containing an equivalent amount of a pharmaceutically acceptable base, i.e. a base containing one of the above preferred cations, followed by concentrating the resulting mixture to give the desired product. The bases can be selected from hydroxides, oxides 20 or carbonates.

Also a significant part of this invention are prodrugs of the compounds of formula (I) described herein.

These prodrugs, which have fewer gastrointestinal side effects, degrade in situ to the parent compound. Examples of prodrugs of the compounds of formula 25 (I) are enol esters and their ethers of formula (II). OR5 R \ * 2

. c ~ 'v / VVR

A ’1

R R

wherein each of R 1, R 2, R 3 and R 4 is as defined above and R 5 is alkanoyl, cycloalkylcarbonyl, phenylalkanoyl, chlorobenzoyl, methoxybenzyl, phenyl, tenon-7,7827yl, omega-alkoxycarbonylalkanoyl, alkoxycarbonyl, 1-oxoxycarbonyl, phenoxycarbonyl alkoxyalkyl, 1-alkoxycarbonyloxyalkyl, alkyl, alkylsulfonyl, methylphenylsulfonyl or dialkylphosphonate.

In formula (II), the carbon atom at the 3-position of the exocyclic double bond of the wavy lines is intended to describe the forms of syn, anti and syn and anti mixtures of the compounds of formula (II).

Compounds of formula (II) are prepared by treating the appropriate 3-acyl-2-oxindole of formula (I) and an equimolar amount of triethylamine in a reaction-inert solvent (e.g. chloroform) with the necessary acid chloride, chloroformate, oxonium salt or alkylating agent. with a small excess at 0 ° C. The reaction mixture is allowed to warm to room temperature and after 2-3 hours the product is recovered by known methods.

Another method of preparing compounds of formula (II) comprises combining a suitable 3-acyl-2-oxindole of formula (I) in an anhydrous reaction-inert solvent such as acetone, a three-molar excess of essential alpha-chloroalkyl carbonate, a five-fold molar excess of sodium iodide and a five-fold molar excess of iodine. anhydrous potassium carbonate, and refluxing said reaction mixture at reflux for 16 hours.

The reaction mixture is diluted with water and the product is extracted with a water-immiscible solvent such as diethyl ether or chloroform. Concentration of the solvent in the product gives a crude material which can be purified by recrystallization and / or chromatography.

As previously shown, the oxindole carboxamides of this invention and their pharmaceutically acceptable salts are useful anti-inflammatory agents in mammals. These compounds are valuable in the alleviation of the swelling and inflammation that are symptoms of rheumatoid arthritis and related disorders that respond to treatment with anti-inflammatory agents. Either as individual therapeutic agents or as mixtures of therapeutic agents, they may be administered alone, but will generally be administered with a pharmaceutical carrier selected on the basis of the chosen route of administration and standard pharmaceutical practice. For example, they may be administered orally in the form of tablets or capsules containing excipients such as starch, milk sugar or certain types of clay, etc. They may be administered orally in the form of elixirs or oral suspensions with the active ingredients in combination with emulsifying and / or suspending agents. They can be injected parenterally, and for this use they, or suitable derivatives, can be prepared in the form of sterile aqueous solutions. Such aqueous solutions should be suitably buffered, if necessary, and contain other solutes, such as salt or glucose, to render them isotonic. The weight ratio of pharmaceutically acceptable carrier to compound may be 1: 4 to 20: 1.

The dose required to reduce inflammation or edema in arthritic subjects would be determined by: 25 the nature and extent of the symptoms. Usually small doses are needed initially, with the dose gradually increasing until the optimum level is determined. It is generally found that when the composition is administered orally, higher amounts of active ingredient are required to produce the same level as produced with a smaller amount administered parenterally. Generally, about 10 to about 300 mg of active ingredient per kilogram of body weight administered orally in single or multiple unit doses is effective in reducing inflammation and edema. Parenteral administration requires doses of li 9 92827 containing from about 5 to about 200 mg of active ingredient to achieve the same result.

A standard method for detecting and comparing the anti-inflammatory activity of the compounds is the rat foot swelling test of the carra-5 gene performed by C.A. Winter et al., Proc. Soc. Exp. Biol., Vol. III, page 544 (1962).

In addition to being useful as anti-inflammatory agents, the compounds of this invention may be used in the treatment of asthma, bronchitis and psoriasis; they can also be used as analgesic agents.

The following examples are provided for further illustration only. Nuclear magnetic resonance spectra (NMR) were measured at 60 MHz for solutions in deuterochloroform (CDCl 3) and peak positions are expressed in parts per million (ppm) downstream of tetramethylsilane or sodium 2,2-dimethyl-2-silapentane-5-sulfonate. The following abbreviations are used for peak shapes: s, singlet; d, doublets; 20 t, triplet; q, quartet; m, multiplet; b, wide.

Example 1 1- (2-Thiazolyl) -3- (2-furoyl) -2-oxindole To a solution of 1- (2-thiazolyl) -2-oxindole (0.6 g, 2.7 mM) in dimethylformamide (8 mL). At 25 ° C, 4-dimethylaminopyridine (0.847 g, 2.2 eq.) Was added and the mixture was stirred for 5 minutes. A solution of 2-furoyl chloride (0.31 mL, 3.04 mM, 1.1 eq.) In dimethylformamide (2 mL) was then added dropwise and the mixture was stirred for 15 minutes at 0 ° C and then at room temperature for 2 hours.

The reaction mixture was poured onto about 100 mL of ice / 2 N HCl and the resulting yellow precipitate was collected by filtration, washed with water and air dried. Recrystallization from toluene-hexane (1: 1) gave 0.585 g (64%) of the title compound as yellow needles; mp. 156-35 157 ° C.

10 92827

In a similar manner, the following compounds were prepared from the appropriate starting materials.

0 "2 © ex R1 R1 R2 (m.p. ° C) 10 2-thiazolyl 2-thienyl 168-9 3-thienyl 2-furyl 132-3 3-thienyl 2-thienyl 130-2 (dec.)

Example 2 Following the procedure of Example 1, the following compounds are prepared from the appropriate starting materials: R 30

fer ~ fc ~ R

20 R4 k1 R3 R4 R1 R2 HH 2-thiazolyl C6H5 25 HH 2-thiazolyl 4-FC6H4 HH 2-thiazolyl 4-ClC6H4 HH 2-thiazolyl 2,4-F2C6H3 HH 2-thiazolyl 3-thienyl HH 2-thiazolyl 2-CF3 30 HH 2 -thiazolyl 4-CH 3 C 6 H 4 HH 2-thiazolyl 4-CH 3 O-6-ClC 6 H 3 HH 2-thiazolyl 2,6- (CH 3) 2 C 6 H 3 HH 2-thiazolyl 4-NO 2 C 6 H 4 HH 2-thiazolyl 4- (CH 3 S) C 6 H 4 35 5 -C1H2-thiazolyl 2-thienyl «11 92827 5- C1H2-thiazolyl 3-furyl-6HH2-thiazolyl C6H5H7-F2-thiazolyl 2,4-Cl2C6H35-F6-F2-thiazolyl 4-FC6H4 5H7-C2H5 2-thiazolyl 3-thienyl-4CH3H2-thiazolyl-2-uryl H6-CF3 2-thiazolyl 4-ClC6H4HH3-thienyl C6H5HH3-thienyl 4-ClC6H4 10HH3 -thienyl 4-FC6H4HH3-thienyl 2,4-Cl2C6H3HH3-thienyl 2-CF3C6H4 5- C1H3-thienyl 4- (C2H50) C6H4 5_FH3-thienyl 3-thienyl 15_F6-F3-thienyl 3-thienyl 5-NO 2 H 3-thienyl 2-furyl 4-OCH 3 6-OCH 3 3-thienyl C 6 H 5 5-OCH 3 6-Cl 3-thienyl 4-FC 6 H 4 5-CF 3 H 3-thienyl 2-furyl 20 5-Br H 3-thienyl C 6 H 56 -I-C 3 H 7 H 3 -thienyl 4-ClC6H4 HH 3-thienyl 4- (CH3S) C6H4 HH 2-thienyl 3-thienyl 4-SCH3 H 2-thienyl 3-furyl • 25 5-C16-C1 2-thienyl C6H5 6- FH 2-thienyl C6H5 5 - OCH 3 6 -F 2-thienyl C 6 H 5 4-C 2 H 5 H 2 -thienyl 3-thienyl 5-C 1-6 C 2 -thienyl 2-thienyl 30-Br H 2 -thienyl C 6 H 5 4 -OCH 3 7-OCH 3 2-thienyl 2 , 4-F 2 C 6 H 3 5-CF 3 H 2 -thienyl 2-thienyl 5-CH 3 7 -Cl 2-thienyl 4- (CH 3 O) C 6 H 4 HH 3 -furyl 3-thienyl 35 HH 3 -furyl 3-furyl 12 92827 HH 3-furyl C6H5HH3-furyl 4-ClC6H4HH3-furyl 2,4-C6H3HH3-furyl 4-ClC6H4 5 5-F6-F3-furyl C6H5H6-F3-furyl C6H5 5-C1H3-furyl C6H5 5-CH3 H 3-furyl 4-FC6H4 5-OCH3 6-C1-3-furyl 4-ClC6H4 10 5-CH3 6-CH3 3-furyl 4-FC6H4 5-CF3 H 3-furyl 2,4-F2C6H3 5- NO2 H 3-furyl 2-ClC6H4 HH 2-furyl 2-thienyl HH 2-furyl 3-furyl 15 HH 2-furyl C6H5 HH 2-furyl 2-FC6H4 HH 2-furyl 4-ClC6H4 5-F 6-F 2- furyl C6H5 H6-C12-furyl 4-ClC6H420-OCH36-F2-furyl 4-FC6H4H7-i-C4H9 2-furyl 2,4-F2C6H3H6-CF3 2-furyl 4CH3C6H4 4- NO2 7 C1 2-furyl C6H5 5- Br6-CH3 2-furyl 4-ClC6H4 25

Preparation A

1- (3-Thienyl) indole

A mixture of indole (16 g, 0.136 M), 3-bromothiophene (24.75 g, 0.146 M), potassium carbonate (20.1 g, 0.146 M) and copper bromide (0.84 g, 0.003 M) in 160 mL: N-methyl-2-pyrrolidinone was stirred and heated to 180 ° C (nitrogen atmosphere) for 42 hours. After this time, the reaction mixture was poured into 800 mL of water and extracted with ethyl acetate (2 x 350 mL). The combined ethyl acetate extracts were washed with water, brine, dried over magnesium sulfate.

• L O

filtered and concentrated in vacuo to give a dark brown-black oil. The crude reaction product was chromatographed on a silica gel column with hexane / CH 2 Cl 2 3: 1 as eluent. Yield - 9.14 g of a yellow liquid which was homogeneous by thin layer chromatography. MS: M + = 199.

Analysis calculated for C 12 H 9 NS: C 72.32; H 4.55; N 7.23%

Found: C, 72.06; H 4.71; N 7.47%.

In a similar manner, the following 1- (heteroaryl) indoles are prepared from the appropriate bromoeteroaryl starting materials:

Cu

15 M

R

MS: R 1 M + 2-thienyl 199 20 3-furyl (a) 183 (100) 2-thiazolyl, (b) 200 (100) (a) Rf (CH 2 Cl 2) = 0.67 25 (b) 100% excess 2 was used -tiatsolyylibromidia.

Product R (in CH 2 Cl 2 = 0.45.

Preparation B

1- (3-Thienyl) oxindole To a solution of 1- (3-thienyl) indole (9.14 g, 0.0459 M) in 350 mL of dry methylene chloride under nitrogen was added 6.44 g (0.0482 M) N-chlorosuccinimide (NCS) at room temperature. The reaction mixture was stirred at room temperature for 2 hours and then concentrated in vacuo. The foamy residue thus obtained was immediately dissolved in 35,190 ml of glacial acetic acid. The resulting mixture was heated to 14,982,770 ° C, followed by the addition of 49.5 mL of 85% H 3 PO 4 and heating the reaction mixture to reflux for 1 h. The mixture was then cooled to room temperature, poured into ice water, basified to about pH 11-12 with Na 2 CO 3 and extracted with ethyl acetate (3 x 500 mL). The combined ethyl acetate extracts were washed with water, brine, dried (MgSO 4), filtered and concentrated in vacuo to give a dark brown-black oil. Purification of the crude product on a silica gel column (elution with CH 2 Cl 2 followed by elution with 90% CH 2 Cl 2-10% CH 3 OH) gave a total of 7.2 grams (72.8%) of a brown crystalline solid; mp. 62-67 ° C.

MS: M + = 215. IR (KBr) 5.9 p (s) c = 0. NMR (CDCl 3) δ: 3.6 (s, 2H), 6.7-7.4 (m, 7H).

The following 1- (heteroaryl) indoles are prepared according to the above procedure from the products of Preparation A.

20 R1

MS

R 1 M * 25 2-thienyl 215 3-furyl (a) 199 (100) 2-thiazolyl (b) 216 (78) 30 (a) 1 H-NMR (CDCl 3) delta: 7.8-6.6 (m, 7H), 3.55 (s. 2H).

(b) TLC (3% CH 3 OH / CH 2 Cl 2): R f = 0.35 1 H-NMR (CDCl 3) δ: 7.0 - 7.6 (m, 6H), 3.6 (s, 2H).

a

II

15 92827

Preparation C

Starting from the appropriate substituted indole and F 1 Br starting materials, the following compounds are prepared according to the method of Preparation A.

R 4 R * R 1 4-FH 3-thienyl 5-FH 3-thienyl 6-FH 3-thienyl 15 H 7 -F 3-thienyl 4-C 1 H 3 -thienyl 5-C 1 H 3 -thienyl 6 - C1 H3-thienyl H7-C13-thienyl 20-CF3 H 3-thienyl 5-CH3 H 3-thienyl H7-C2H5 3-thienyl 6-Br H 3-thienyl 4-OCH3 H 3-thienyl. 25 4-SCH3 H 3-thienyl 5-NO2 H 3-thienyl 4-OCH3 6-OCH3 3-thienyl 4- C1-5-NO2 3-thienyl 5- CH3 7-C13-thienyl 30 5-C16-C13 -thienyl 5-F 6 -F 3-thienyl 4-CH 3 7 -CH 3 3-thienyl 5-OCH 3 6-C 1-3 thienyl 5-OCH 3 6 -F 3-thienyl 35 H 7 -1-C 4 H 9 3-thienyl 16,92827 5- FH 2 -thienyl 6- FH 2 -thienyl 5-C 1 H 2 -thienyl 5 CF 3 H 2 -thienyl 5 5-CH 3 H 2 -thienyl 6- Br H 2 -thienyl 4-SCH 3 H 2 -thienyl 4- OCH 3 6 -OCH 3 2-thienyl 5-CH 3 7 -Cl 2-thienyl 10 5-F 6 -F 2-thienyl 5-OCH 3 6 -F 2-thienyl 5-CF 3 H 2 -thienyl 5-FH 3 -furyl 6- C1 H 3-furyl 15 4-SCH3 H 3-furyl 6-CF3 H 3-furyl 6-Br H 3-furyl 4- SCH3 H 3-furyl 6- NO2 H 3-furyl 20 4-C1 6-C1 3- furyl 7-CH 3 H 3 -furyl H 7 -1-C 4 H 9 3-furyl 5-Br 7 -CH 3 3-furyl 5-CH 3 6 -CH 3 3-furyl 25-OCH 3 6-OCH 3 3-furyl 5-OCH 3 6- C1-3-furyl 5-FH2-furyl 5-C1H2-furyl-6-CF3H2-furyl 30-SCH3H2-furyl 5-NO2 H2-furyl 5-OCH36-C12-furyl 5- OCH 3 6 -OC 2 H 5 2 -furyl 5-CH 3 7 -C12-furyl 35 5-C17-C12-furyl I! 17 92827 6-i-C3H7 H 2 -furyl 4- NO2 7-C1 2-furyl 5-OCH3 6-F2-furyl 5- Br7-CH3 2-furyl 5 5-FH 2-thiazolyl 6 FH 2- thiazolyl 5-C1H2-thiazolyl 5-Br H2-thiazolyl H7-C2H5 2-thiazilyl 10 6-CF3 H 2-thiazolyl 5-CH3 H 2-thiazolyl 6- NO2 H 2-thiazolyl 6-i-C3H7 H 2-thiazolyl 4-OCH 3 7-OCH 3 2-thiazolyl 5-OCH 3 6-OCH 3 2-thiazolyl 5-CH 3 6-CH 3 2-thiazolyl 5-OCH 3 6 -F 2-thiazolyl 4-SCH 3 H 2 -thiazolyl 5-CH 3 6-C1-2-thiazolyl 20 -NO2 7-C12-thiazolyl 5-C17-C12-thiazolyl

Preparation D

The compounds of Preparation C are converted to the corresponding oxindoles of the formula shown below using the method of Preparation B: J4

R K

Claims (4)

92827 A process for the preparation of novel therapeutically useful 1-heteroaryl-3-acyl-2-oxindole derivatives of the formula n * 2 ΟΓΊ 10 R K1 wherein R 1 is thienyl, furyl or 2-thiazolyl, R 2 is thienyl, furyl or ήτ Y wherein X is hydrogen, fluorine, chlorine, alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, alkyl-thio , having 1 to 4 carbon atoms, nitro or trifluoromethyl, Y is hydrogen, fluorine or chlorine, and R 3 and R 4, which may be the same or different, are each hydrogen, fluorine, chlorine, bromine, alkyl having 1 to 4 carbon atoms. 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, alkylthio of 1 to 4 carbon atoms, nitro or trifluoromethyl, and pharmaceutically acceptable base salts thereof, characterized in that the compound of formula 92827 Ϊ &. w Β <il wherein R 1, R 3 and R 4 are as defined above, is reacted with a compound of formula R 2 CoCl, wherein R 2 is as defined above; and, if desired, converting a compound of formula I to a pharmaceutically acceptable base salt. Process according to Claim 1, characterized in that a compound of the formula I in which R 1 is thienyl is prepared by reacting a compound of the formula C in which R 1 is thienyl with a compound of the formula R 2 CoCl. Process according to Claim 1, characterized in that a compound of the formula I in which R 1 is furyl is prepared by reacting a compound of the formula C in which R 1 is furyl with a compound of the formula R 2 COCl. Process according to Claim 1, characterized in that the compound of the formula c is obtained by reacting a compound of the formula "wherein R 1, R 3 and R 4 have the same meaning as in Claim 1 with N-chlorosuccinamide. 92827